What is "junit"

The Junit is an open-source framework, which supports the creation of automated tests in the Java programming language.

This framework facilitates code creation for test automation with presentation of results. With it, it can be checked if each method of a class works in the expected way, displaying possible errors or failures can be used both for the execution of battery tests and for extension. With Junit, the programmer has the possibility to use this tool to create a standard model of tests, often in an automated way.

The unit test tests the smallest component of a system in isolation. Each of these units defines a set of stimuli (called methods), and input and output data associated with each stimulus. Inputs are parameters and outputs are the return value, exceptions or object state. Typically a unit test runs a method individually and compares a known output after processing it.